In the past there have been far too many night calls for aircraft for trivial reasons. I do see that since the tradgedy of BDZ there has been a change in the attitude of the oil companies and they would reject any call from offshore that was not of a serious nature. Not always going to be the case of course but we can only hope!
Interesting thing came up in a related chat today - apparently the NCAA has recently clarified the parameters permitting night flights by helicopters in Nigeria - I'll research further tomorrow and post the definitive legislation if I find it, but allegedly, the person responsible for initiating any call out will be required to justify the action in writing after the event to the NCAA.
This may sort out the problems experienced in the past!
Trog